US20210215135A1 - Method for controlling a wind power installation - Google Patents
Method for controlling a wind power installation Download PDFInfo
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- US20210215135A1 US20210215135A1 US17/144,818 US202117144818A US2021215135A1 US 20210215135 A1 US20210215135 A1 US 20210215135A1 US 202117144818 A US202117144818 A US 202117144818A US 2021215135 A1 US2021215135 A1 US 2021215135A1
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- grid
- wind power
- time constant
- power installation
- voltage
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- 238000009434 installation Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/028—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
- F03D7/0284—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to the state of the electric grid
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Definitions
- the disclosure relates to a method for controlling a wind power installation and to such a wind power installation.
- wind power installations inject the electrical power generated from the wind into the electrical power supply grid by means of a converter.
- Such reactions can occur in particular in soft electrical power supply grids, i.e., electrical power supply grids with a low short-circuit power ratio (SCR for short).
- SCR short-circuit power ratio
- a method for controlling a wind power installation comprising the steps of: measuring a grid voltage of an electrical power supply grid, and, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and, using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.
- the setting of the DC-link voltage in this case takes place depending on a measured grid voltage and preferably on a or the working point of the converter.
- the first time constant and the second time constant have the object of damping the direct coupling between the working point-dependent DC-link voltage and the grid voltage of the electrical power supply grid, in particular such that the influence of the grid voltage on the DC-link voltage is lessened.
- the disclosure proposes in particular that the first time constant is different than the second time constant.
- the first time constant is less than 0.1 second
- the second time constant is approximately 1 second.
- the converter decides or differentiates between a grid voltage rise of the electrical power supply grid and a grid voltage drop of the electrical power supply grid.
- the converter is operated with two different gradients, namely a steep gradient for the DC-link voltage in the event of a rise in the grid voltage and a flat gradient for the DC-link voltage in the event of a drop in the grid voltage.
- a soft power supply grid is understood to mean in particular grid sections and/or grid connection points which respond in a sensitive manner to changes in the injection from the generating units, i.e., for example, grid connection points with a short-circuit ratio (SCR for short) of less than 6 or less than 4.
- SCR short-circuit ratio
- the method for controlling a wind power installation further comprises the following step: establishing a positive or negative grid voltage change depending on the measured grid voltage, wherein the first time constant is assigned to a positive grid voltage change, and the second time constant is assigned to a negative grid voltage change.
- the measuring of the grid voltage is repeated, in particular continuously, and that a voltage change in the grid voltage of the electrical power supply grid is determined from the thus measured grid voltages.
- This voltage change in the grid voltage of the electrical power supply grid can also be referred to as grid voltage change.
- first time constant is assigned to each positive grid voltage change
- second time constant is assigned to each negative grid voltage change
- the first and the second time constants are used independently of the absolute value of the voltage change; for example, the first time constant is 0 seconds for all positive grid voltage changes and 0.5 seconds for all negative grid voltage changes.
- the method for controlling a wind power installation further comprises the following step: measuring a line impedance of a line reactor, wherein the DC-link voltage is additionally set depending on the measured impedance.
- the method for controlling a wind power installation further comprises the following step: measuring a phase angle and/or an amplitude of a current to be injected, wherein the DC-link voltage is additionally set depending on the measured phase angle and/or the measured amplitude of the current to be injected.
- the DC-link voltage is set depending on a grid voltage change of the electrical power supply grid, the impedance of the line reactor, the phase angle and the amplitude of the current to be injected.
- the first time constant is in a range of between 0 and 1 seconds, preferably below 0.2 seconds, particularly preferably the first time constant is substantially 0 seconds.
- the second time constant is in a range of between 0 and 5 seconds, preferably between 0.5 and 4 seconds, particularly preferably above 1 second.
- the DC-link voltage of the converter is therefore controlled in such a way that, in the event of a drop in the grid voltage, the DC-link voltage responds with a time delay.
- the disclosure further proposes the use of a method as described above or below in a wind power installation which is connected to an electrical power supply grid which has a comparatively high line impedance and/or is in the form of a soft grid and/or has a low short-circuit power ratio, in particular an SCR of less than 6.
- the wind power installation is connected to an electrical power supply grid which has a comparatively high line impedance and/or is in the form of a soft grid and/or has a low short-circuit current ratio (SCR for short).
- SCR short-circuit current ratio
- the disclosure further proposes a wind power installation, comprising: a converter, which has a DC link with a DC-link voltage, and which is designed to inject electrical power into an electrical power supply grid depending on a measured grid voltage, and a controller, which is at least designed to measure a grid voltage of an electrical power supply grid and to set the DC-link voltage using a first and a second time constant.
- the controller is further designed to establish whether there is a positive or negative grid voltage change within the electrical power supply grid.
- the wind power installation further comprises means which are designed to measure a phase angle of a current to be injected and/or an amplitude of a current to be injected.
- These means may be, for example, measuring devices or measuring instruments (sensors) which are arranged at the output of the converter, i.e., between the converter and the electrical power supply grid.
- the controller is further designed to implement a method described above or below.
- the converter is part of a full-power converter concept of the wind power installation, and the DC-link voltage of the converter is set by means of a step-up converter and/or a DC-DC converter.
- the wind power installation is a wind power installation with a full-power converter concept, such as described by way of example below.
- FIG. 1 shows a schematic illustration, by way of example, of a perspective view of a wind power installation in one embodiment
- FIG. 2 shows a schematic illustration, by way of example, of a design of an electrical phase of a wind power installation according to the invention
- FIG. 3 shows a schematic illustration, by way of example, of the characteristic of a DC-link voltage of an inverter, which is operated using a method according to the invention, depending on a grid voltage.
- FIG. 1 shows a perspective view of a wind power installation 100 .
- the wind power installation 100 has, in addition, a tower 102 and a nacelle 104 .
- An aerodynamic rotor 106 having three rotor blades 108 and a spinner 110 is arranged on the nacelle 104 .
- the rotor 106 is set in rotary motion during operation by the wind and thus drives a generator in the nacelle.
- the generator generates a current to be injected, which is injected into an electrical power supply grid by means of an inverter.
- FIG. 2 shows a schematic illustration, by way of example, of an electrical phase 100 ′ of a wind power installation 100 according to the disclosure, as shown preferably in FIG. 1 .
- the aerodynamic rotor of the wind power installation 106 is connected to the generator 120 of the wind power installation.
- the generator 120 is in this case in the form of a six-phase ring generator.
- the generator 120 is connected to an electrical power supply grid 200 via a converter 130 by means of a grid protection device 140 and a transformer 150 .
- the converter 130 has, at the converter input, a rectifier 132 .
- the rectifier 132 is additionally connected to a first DC link 133 .
- the first DC link 133 is in turn connected to a step-up converter 134 .
- the step-up converter 134 is in turn connected to a chopper 135 .
- the chopper 135 is in turn connected to a second DC link 136 .
- the second DC link 136 is in turn connected to an inverter 137 .
- the inverter 137 itself in this case forms the converter output, which is provided with a grid protection device 140 .
- the grid protection device 140 comprises, for example, an interaction-limiting reactor 142 , a filter 144 and a line reactor 146 .
- the grid protection device 140 is therefore in the form of an LCL filter.
- a wind power installation transformer 150 is provided, which is preferably star-delta connected.
- the electrical power supply grid 200 to which the wind power installation 100 is connected by means of the transformer 150 may be, for example a wind farm grid or an electrical power supply grid or distribution grid.
- a controller 160 is provided.
- the controller 160 is designed to measure the current I INJ to be injected by means of a current measurement sensor 162 .
- the controller also has voltage measurement sensor 164 , which are designed to measure a grid voltage of the electrical power supply grid 200 .
- the controller 160 is additionally designed to measure the phase angle and the amplitude of the current I INJ to be injected as well.
- the controller is also designed to determine the impedance of the grid protection device 140 . This can take place, for example, via a measurement or by a parameterization of the controller 160 .
- the controller determines the time constants T 1 and T 2 , which are passed on to the converter 130 by means of a signal line 166 .
- the time constants can also be calculated or simulated and then parameterized in the wind power installation.
- the converter 130 it is also conceivable for the converter 130 to have an active rectifier, which combines the principles of operation of the component parts 132 , 133 , 134 such that the time constants T 1 and T 2 are then used to activate this active rectifier.
- the converter 130 has a field current unit 138 , which is designed to provide a field current for the generator 120 from the DC link 133 .
- FIG. 3 shows a schematic illustration, by way of example, of the characteristic of a DC-link voltage of an inverter of a wind power installation depending on a measured grid voltage using the method according to the disclosure.
- the DC-link voltage U D2 is plotted over time.
- the DC-link voltage U D2 is the DC-link voltage of a second DC link 136 , as shown in particular in FIG. 1 .
- the time characteristic in the graphical representations 301 and 302 is substantially time-synchronous. This is indicated by the dashed lines t 1 , t 2 , t 3 , t 4 , t 5 .
- the graph 310 in the upper graphical representation 301 in this case shows the characteristic of the grid voltage U grid of the electrical power supply grid.
- this grid voltage U grid collapses, whereupon the DC-link voltage U D2 , which is indicated by the graph 320 in the lower graphical representation 302 , is reduced slowly by means of the time constant T 1 .
- the grid voltage U grid recovers again or rises to its original level, whereupon the DC-link voltage U D2 is raised directly again by means of the time constant T 2 .
- the direct rise in the DC-link voltage U D2 at times t 2 and t 3 is in this case caused by the time constant T 1 , which is substantially 0 seconds.
- the slow reduction in the DC-link voltage from times t 1 and t 4 is in this case caused by the second time constant T 2 , which is substantially set to a value in the range of between 0.5 and 4 seconds.
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Abstract
Description
- The disclosure relates to a method for controlling a wind power installation and to such a wind power installation.
- Generally, wind power installations inject the electrical power generated from the wind into the electrical power supply grid by means of a converter.
- This may result in reactions from the electrical power supply grid on the converter, and there in particular on the DC-link voltage of the converter.
- It may therefore arise, for example, that these reactions result in the DC-link voltage of the converter fluctuating severely, as a result of which the converter no longer operates optimally or can no longer be operated at an optimum working point.
- Such reactions can occur in particular in soft electrical power supply grids, i.e., electrical power supply grids with a low short-circuit power ratio (SCR for short).
- Provided are techniques which results in an optimization or smoothing of the DC-link voltage, and thus to a stabilization of the output variables of a converter of a wind power installation, preferably, even when the wind power installation is connected to a soft electrical power supply grid. Provided is a method for controlling a wind power installation, comprising the steps of: measuring a grid voltage of an electrical power supply grid, and, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and, using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.
- It is therefore in particular proposed to operate the converter of a wind power installation depending on a measured grid voltage of an electrical power supply grid, in particular by means of a working point-dependent DC-link voltage.
- The setting of the DC-link voltage in this case takes place depending on a measured grid voltage and preferably on a or the working point of the converter.
- The first time constant and the second time constant have the object of damping the direct coupling between the working point-dependent DC-link voltage and the grid voltage of the electrical power supply grid, in particular such that the influence of the grid voltage on the DC-link voltage is lessened.
- For this purpose, the disclosure proposes in particular that the first time constant is different than the second time constant. For example, the first time constant is less than 0.1 second, and the second time constant is approximately 1 second.
- This means in particular that the influence of the grid voltage on the DC-link voltage is handled differently for a rise or a drop in the grid voltage.
- It is therefore in particular proposed that the converter, and there in particular the DC-link voltage, decides or differentiates between a grid voltage rise of the electrical power supply grid and a grid voltage drop of the electrical power supply grid.
- For this purpose, it is in particular proposed, that, in the event of a rise in the grid voltage, a direct rise in the DC-link voltage takes place, and that, in the event of a drop in the grid voltage, a slow reduction in the DC-link voltage takes place.
- It is therefore in particular also proposed, that the converter is operated with two different gradients, namely a steep gradient for the DC-link voltage in the event of a rise in the grid voltage and a flat gradient for the DC-link voltage in the event of a drop in the grid voltage.
- It is thus, in particular, possible to optimize the output variables of a converter of a wind power installation in such a way that the wind power installation can also be connected to a soft electrical power supply grid, in particular without the wind power installation or without the operating behavior of the wind power installation having a negative effect on the electrical power supply grid.
- Here, a soft power supply grid is understood to mean in particular grid sections and/or grid connection points which respond in a sensitive manner to changes in the injection from the generating units, i.e., for example, grid connection points with a short-circuit ratio (SCR for short) of less than 6 or less than 4.
- Preferably, the method for controlling a wind power installation further comprises the following step: establishing a positive or negative grid voltage change depending on the measured grid voltage, wherein the first time constant is assigned to a positive grid voltage change, and the second time constant is assigned to a negative grid voltage change.
- It is therefore, in particular, proposed that the measuring of the grid voltage is repeated, in particular continuously, and that a voltage change in the grid voltage of the electrical power supply grid is determined from the thus measured grid voltages. This voltage change in the grid voltage of the electrical power supply grid can also be referred to as grid voltage change.
- Preferably, in addition, a distinction is drawn between a positive and a negative grid voltage change.
- In addition, the first time constant is assigned to each positive grid voltage change, and the second time constant is assigned to each negative grid voltage change.
- It is therefore, in particular, also proposed that the first and the second time constants are used independently of the absolute value of the voltage change; for example, the first time constant is 0 seconds for all positive grid voltage changes and 0.5 seconds for all negative grid voltage changes.
- By virtue of such a selection of the time constants, it is possible in particular to damp the direct coupling between the working point-dependent DC-link voltage and the grid voltage, and thus in particular the influence of the grid voltage on the DC-link voltage is reduced.
- In addition, it has been identified according to the disclosure that, given the correct choice of the time constants, as described above and below, smoothing of the DC-link voltage results, as a result of which the converter has working points which are more optimal.
- Preferably, the method for controlling a wind power installation further comprises the following step: measuring a line impedance of a line reactor, wherein the DC-link voltage is additionally set depending on the measured impedance.
- It is therefore also proposed likewise to take into consideration the impedance of any line reactor which may be arranged at the output of the converter.
- Preferably, the method for controlling a wind power installation further comprises the following step: measuring a phase angle and/or an amplitude of a current to be injected, wherein the DC-link voltage is additionally set depending on the measured phase angle and/or the measured amplitude of the current to be injected.
- It is therefore additionally also proposed to take into consideration the phase angle and/or the amplitude of the current to be injected.
- In a particularly preferred embodiment, it is therefore proposed that the DC-link voltage is set depending on a grid voltage change of the electrical power supply grid, the impedance of the line reactor, the phase angle and the amplitude of the current to be injected.
- Preferably, the first time constant is in a range of between 0 and 1 seconds, preferably below 0.2 seconds, particularly preferably the first time constant is substantially 0 seconds.
- It is therefore in particular also proposed that, in the event of a rise in the grid voltage, a direct rise in the DC-link voltage results.
- Preferably, the second time constant is in a range of between 0 and 5 seconds, preferably between 0.5 and 4 seconds, particularly preferably above 1 second.
- It is therefore in particular proposed that, in the event of a drop in the grid voltage, the DC-link voltage is corrected only slowly, for example by means of a flat gradient.
- The DC-link voltage of the converter is therefore controlled in such a way that, in the event of a drop in the grid voltage, the DC-link voltage responds with a time delay.
- The disclosure further proposes the use of a method as described above or below in a wind power installation which is connected to an electrical power supply grid which has a comparatively high line impedance and/or is in the form of a soft grid and/or has a low short-circuit power ratio, in particular an SCR of less than 6.
- It is therefore also proposed to use methods described above or below in particular in the case of wind power installations which are connected to a soft electrical power supply grid.
- Preferably, therefore, the wind power installation is connected to an electrical power supply grid which has a comparatively high line impedance and/or is in the form of a soft grid and/or has a low short-circuit current ratio (SCR for short).
- The disclosure further proposes a wind power installation, comprising: a converter, which has a DC link with a DC-link voltage, and which is designed to inject electrical power into an electrical power supply grid depending on a measured grid voltage, and a controller, which is at least designed to measure a grid voltage of an electrical power supply grid and to set the DC-link voltage using a first and a second time constant.
- It is therefore in particular proposed that the method described above or below is implemented by a controller, which preferably uses the described time constants to set the DC-link voltage of a converter.
- Preferably, the controller is further designed to establish whether there is a positive or negative grid voltage change within the electrical power supply grid.
- Preferably, the wind power installation further comprises means which are designed to measure a phase angle of a current to be injected and/or an amplitude of a current to be injected.
- These means may be, for example, measuring devices or measuring instruments (sensors) which are arranged at the output of the converter, i.e., between the converter and the electrical power supply grid.
- Preferably, the controller is further designed to implement a method described above or below.
- Preferably, the converter is part of a full-power converter concept of the wind power installation, and the DC-link voltage of the converter is set by means of a step-up converter and/or a DC-DC converter.
- It is in particular therefore also proposed that the wind power installation is a wind power installation with a full-power converter concept, such as described by way of example below.
- The present disclosure will now be explained in more detail below by way of example and using exemplary embodiments with reference to the attached figures, wherein the same reference symbols are used for identical or similar component parts. In the drawings:
-
FIG. 1 shows a schematic illustration, by way of example, of a perspective view of a wind power installation in one embodiment, -
FIG. 2 shows a schematic illustration, by way of example, of a design of an electrical phase of a wind power installation according to the invention, and -
FIG. 3 shows a schematic illustration, by way of example, of the characteristic of a DC-link voltage of an inverter, which is operated using a method according to the invention, depending on a grid voltage. -
FIG. 1 shows a perspective view of awind power installation 100. - The
wind power installation 100 has, in addition, atower 102 and anacelle 104. Anaerodynamic rotor 106 having threerotor blades 108 and aspinner 110 is arranged on thenacelle 104. Therotor 106 is set in rotary motion during operation by the wind and thus drives a generator in the nacelle. As a result, the generator generates a current to be injected, which is injected into an electrical power supply grid by means of an inverter. -
FIG. 2 shows a schematic illustration, by way of example, of anelectrical phase 100′ of awind power installation 100 according to the disclosure, as shown preferably inFIG. 1 . The aerodynamic rotor of thewind power installation 106 is connected to thegenerator 120 of the wind power installation. Preferably, thegenerator 120 is in this case in the form of a six-phase ring generator. - In addition, the
generator 120 is connected to an electricalpower supply grid 200 via aconverter 130 by means of agrid protection device 140 and atransformer 150. - In order to convert the electrical power generated by the
generator 120 into a current IINJ to be injected, theconverter 130 has, at the converter input, arectifier 132. Therectifier 132 is additionally connected to afirst DC link 133. The first DC link 133 is in turn connected to a step-upconverter 134. The step-upconverter 134 is in turn connected to achopper 135. Thechopper 135 is in turn connected to asecond DC link 136. The second DC link 136 is in turn connected to aninverter 137. Theinverter 137 itself in this case forms the converter output, which is provided with agrid protection device 140. - The
grid protection device 140 comprises, for example, an interaction-limitingreactor 142, afilter 144 and aline reactor 146. In a preferred embodiment, thegrid protection device 140 is therefore in the form of an LCL filter. - In order to inject the current IINJ to be injected into the electrical
power supply grid 200, in addition a windpower installation transformer 150 is provided, which is preferably star-delta connected. - The electrical
power supply grid 200 to which thewind power installation 100 is connected by means of thetransformer 150 may be, for example a wind farm grid or an electrical power supply grid or distribution grid. - In order to control the
electrical phase 100′, in addition acontroller 160 is provided. - The
controller 160 is designed to measure the current IINJ to be injected by means of acurrent measurement sensor 162. In addition, the controller also hasvoltage measurement sensor 164, which are designed to measure a grid voltage of the electricalpower supply grid 200. - In a particularly preferred embodiment, the
controller 160 is additionally designed to measure the phase angle and the amplitude of the current IINJ to be injected as well. - In a further embodiment, the controller is also designed to determine the impedance of the
grid protection device 140. This can take place, for example, via a measurement or by a parameterization of thecontroller 160. - From the thus measured values, i.e., for example, the grid voltage and the phase angle, the controller then determines the time constants T1 and T2, which are passed on to the
converter 130 by means of asignal line 166. Alternatively, the time constants can also be calculated or simulated and then parameterized in the wind power installation. However, it is also conceivable for theconverter 130 to have an active rectifier, which combines the principles of operation of thecomponent parts - In addition, the
converter 130 has a fieldcurrent unit 138, which is designed to provide a field current for thegenerator 120 from theDC link 133. - The principles of operation resulting from such a design will now be described below with reference to
FIG. 3 . -
FIG. 3 shows a schematic illustration, by way of example, of the characteristic of a DC-link voltage of an inverter of a wind power installation depending on a measured grid voltage using the method according to the disclosure. - In an upper
graphical representation 301, the grid voltage of the electrical power supply grid Ugrid is plotted over time. - In a lower
graphical representation 302, the DC-link voltage UD2 is plotted over time. Preferably, the DC-link voltage UD2 is the DC-link voltage of a second DC link 136, as shown in particular inFIG. 1 . - The time characteristic in the
graphical representations - The
graph 310 in the uppergraphical representation 301 in this case shows the characteristic of the grid voltage Ugrid of the electrical power supply grid. - At time t1, this grid voltage Ugrid collapses, whereupon the DC-link voltage UD2, which is indicated by the
graph 320 in the lowergraphical representation 302, is reduced slowly by means of the time constant T1. - At time t2, the grid voltage Ugrid recovers again or rises to its original level, whereupon the DC-link voltage UD2 is raised directly again by means of the time constant T2.
- At time t3, the grid voltage Ugrid of the electrical power supply grid rises suddenly, whereupon likewise the DC-link voltage UD2 is raised directly again by means of the time constant T2.
- At time t4, the grid voltage Ugrid drops again to its original level, whereupon the DC-link voltage UD2 is lowered again slowly by means of the time constant T1.
- The direct rise in the DC-link voltage UD2 at times t2 and t3 is in this case caused by the time constant T1, which is substantially 0 seconds.
- The slow reduction in the DC-link voltage from times t1 and t4 is in this case caused by the second time constant T2, which is substantially set to a value in the range of between 0.5 and 4 seconds.
- By virtue of such a parameterization of the time constants T1 and T2, it is possible to smooth the DC-link voltage.
- It has therefore been identified in accordance with the disclosure that such a design for the time constants T1 and T2 results in a better quality of the current IINJ to be injected.
- This enables in particular operation of wind power installations on grids with sources of interference (for example large steel factories), on grids with a low SCR and/or enables a greater safety distance from stability limits of the electrical power supply grid and/or the wind power installation.
- The various embodiments described above can be combined to provide further embodiments. These and other changes can be made to the embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.
Claims (12)
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US20100133831A1 (en) * | 2009-11-13 | 2010-06-03 | Scholte-Wassink Hartmut | Method and apparatus for controlling a wind turbine |
US20170358997A1 (en) * | 2014-12-30 | 2017-12-14 | Vestas Wind Systems A/S | Dc-link reference voltage determination for wind turbine converter systems |
US9903344B2 (en) * | 2012-08-07 | 2018-02-27 | Kabushiki Kaisha Toshiba | Power generation system including wind power generation and solar thermal power generation |
US20200195012A1 (en) * | 2018-12-18 | 2020-06-18 | General Electric Company | System and Method for Controlling DC Link Voltage of a Power Converter of an Electrical Power System |
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WO2011160643A2 (en) | 2010-06-25 | 2011-12-29 | Vestas Wind Systems A/S | A wind turbine and a method of operating a wind turbine |
DE102016120700A1 (en) * | 2016-10-28 | 2018-05-03 | Wobben Properties Gmbh | Method for operating a wind energy plant |
ES2927257T3 (en) * | 2017-12-21 | 2022-11-03 | Vestas Wind Sys As | Improvements related to current injection in wind power plants |
DE102018100084A1 (en) | 2018-01-03 | 2019-07-04 | Wobben Properties Gmbh | Wind energy plant for feeding electrical power by means of a full converter |
DK179832B1 (en) * | 2018-01-15 | 2019-07-24 | Vestas Wind Systems A/S | Controling a wind turbine during over-voltage ride through |
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US20100133831A1 (en) * | 2009-11-13 | 2010-06-03 | Scholte-Wassink Hartmut | Method and apparatus for controlling a wind turbine |
US9903344B2 (en) * | 2012-08-07 | 2018-02-27 | Kabushiki Kaisha Toshiba | Power generation system including wind power generation and solar thermal power generation |
US20170358997A1 (en) * | 2014-12-30 | 2017-12-14 | Vestas Wind Systems A/S | Dc-link reference voltage determination for wind turbine converter systems |
US20200195012A1 (en) * | 2018-12-18 | 2020-06-18 | General Electric Company | System and Method for Controlling DC Link Voltage of a Power Converter of an Electrical Power System |
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